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Electrochlorination

Chlorination is probably the most common method of treating microorganisms in water. Electrochlorination is a safe and simple alternative to chlorine gas and commercial hypochlorite solution.

Electrochlorination is mainly used by water utility companies in order to eliminate microorganisms in water, right from the waterworks up to the consumers water tap.

Alternative to chlorine gasChlorine is often used as a disinfectant in the form of a hypochlorite solution that is injected to the water system.The alternative to chlorine gas is the electrolytic production of sodium hypochlorite solution from common salt, water and electricity.

Simple productionAt the electrodes in the electrolytic cell chlorine (at anode) and hydrogen (at cathode) is generated from a salt solution. The chlorine is transformed immediately to a hypochlorite solution which is stored in a tank for further use.

Advantages• Safe and reliable method of producing chlorine on-site• Common salt as base material is nontoxic, easy to store and to handle.• Low operating costs, world-wide use• Fresh hypochlorite is always at hand• Approved disinfection method complying with the drinking water regulations• Less safety requirements than chlorine-gas-based systems• Robust and elementary components – low-maintenance and a longer service life than membrane cell electrolysis• A lower pH-value than commercial sodium hypochlorite reduces scaling of injection points etc. in hard water areas.

Disadvantages• Smell and taste of the water is affected• Sensitive to pH-value of the water. At levels above 7,5 the disinfection effect is reduced • Long term effect on bacteria is limited• Medium effect on biofilm in hot water tank and pipes